<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1027-152X</journal-id>
<journal-title><![CDATA[Revista Chapingo. Serie horticultura]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Chapingo Ser.Hortic]]></abbrev-journal-title>
<issn>1027-152X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Chapingo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1027-152X2022000200109</article-id>
<article-id pub-id-type="doi">10.5154/r.rchsh.2021.07.015</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Cytokinin action revisited: leaf anatomical changes play a key role in 6-benzylaminopurine-driven growth promotion in pot-grown lettuce]]></article-title>
<article-title xml:lang="es"><![CDATA[Reanálisis de la acción de la citoquinina: los cambios anatómicos de la hoja juegan un papel clave en la promoción del crecimiento impulsada por la 6-bencilaminopurina en lechuga cultivada en maceta]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carnelos]]></surname>
<given-names><![CDATA[Danilo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lozano-Miglioli]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Giardina]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tognetti]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Benedetto]]></surname>
<given-names><![CDATA[Alberto Hugo di]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Buenos Aires Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Mar del Plata Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Comisión de Investigaciones Científicas  ]]></institution>
<addr-line><![CDATA[La Plata ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>28</volume>
<numero>2</numero>
<fpage>109</fpage>
<lpage>133</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1027-152X2022000200109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1027-152X2022000200109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1027-152X2022000200109&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Plants raised in small cell trays are often subjected to root growth restrictions. Root tips are a source of cytokinin, and insufficient biosynthesis and transport of this hormone to the aerial part severely impairs shoot development. Exogenous supply of cytokinin to the foliage has been shown to effectively counteract these effects in several horticultural crops, but the physiological processes involved are still unclear. The aim of this work was to study the effect of spraying the cytokinin 6-benzylaminopurine (BAP) on growth and development of plug lettuce seedlings focusing on the morpho-physiological mechanisms involved in plant response. Two experiments were conducted in a greenhouse. Lettuce (Lactuca sativa L. Crimor INTA) seedlings were grown for 35 days in 128-, 200- and 288-cells trays (17.37, 13.90 and 6.18 cm3·cell-1 respectively), after which they were sprayed with BAP (6-benzylaminopurine) solutions (0, 5, 50 or 100 mg·L-1) either immediately before transplant, or 7 days after transplant. Seedlings were transplanted into larger (3,000 cm3) pots in which they grew for further 60 days. Decreasing plug cell volume resulted in a steep decrease in plant net assimilation rate and leaf net photosynthetic rate, but the impact on the relative growth rate was somewhat lower due to an increased leaf area ratio. BAP sprays increased plant biomass accumulation and enhanced the development of photosynthetic area, in parallel with a strong promotion of carbon assimilation, and these effects were more remarkable in plants raised in smaller plugs, and when hormone was supplied at the pre-transplant stage.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las plantas cultivadas en charolas de germinación de celdas pequeñas frecuentemente son sometidas a restricciones radicales. Las puntas de las raíces son una fuente de citoquinina, y la biosíntesis y el transporte de esta hormona a la parte aérea restringe severamente el desarrollo de los brotes. La aplicación de citoquinina al follaje ha demostrado ser efectiva para contrarrestar los efectos negativos en muchos cultivos hortícolas, pero los procesos fisiológicos involucrados permanecen inciertos. El objetivo de este trabajo fue evaluar el efecto de asperjar citoquinina 6-bencilaminopurina (BAP) sobre el crecimiento y desarrollo de plántulas de lechuga, concentrándose en los mecanismos morfo-fisiológicos relacionados con la respuesta de la planta. Se realizaron dos experimentos en un invernadero; para ello, se cultivaron plántulas de lechuga (Lactuca sativa L. Crimor INTA) durante 35 días en charolas de germinación de 128, 200 y 288 celdas (17.37, 13.90 y 6.18 cm3·celda-1, respectivamente), después se asperjaron con soluciones de BAP (0, 5, 50 o 100 mg·L-1), antes del trasplante o 7 días después de este. Las plántulas se trasplantaron en macetas más grandes (3,000 cm3), donde crecieron por 60 días. La disminución de la celda redujo la tasa de asimilación neta de la planta y la tasa fotosintética neta, pero el impacto en la tasa de crecimiento relativo fue un poco menor debido al incremento de la relación del área foliar. Las aspersiones de BAP incrementaron la acumulación de biomasas y ampliaron el desarrollo del área fotosintética; asimismo, se promovió la asimilación de carbono. Estos efectos fueron destacables en las plantas cultivadas en celdas menores, y cuando la hormona fue suministrada en la etapa de pre-trasplante.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[plug cell volume]]></kwd>
<kwd lng="en"><![CDATA[root restriction]]></kwd>
<kwd lng="en"><![CDATA[transplants]]></kwd>
<kwd lng="en"><![CDATA[vegetables]]></kwd>
<kwd lng="es"><![CDATA[volumen de la celda]]></kwd>
<kwd lng="es"><![CDATA[restricción radical]]></kwd>
<kwd lng="es"><![CDATA[trasplantes]]></kwd>
<kwd lng="es"><![CDATA[hortalizas]]></kwd>
</kwd-group>
</article-meta>
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